discourse/lib/post_revisor.rb

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# frozen_string_literal: true
require "edit_rate_limiter"
require 'post_locker'
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class PostRevisor
# Helps us track changes to a topic.
#
# It's passed to `track_topic_fields` callbacks so they can record if they
# changed a value or not. This is needed for things like custom fields.
class TopicChanges
attr_reader :topic, :user
def initialize(topic, user)
@topic = topic
@user = user
@changed = {}
@errored = false
end
def errored?
@errored
end
def guardian
@guardian ||= Guardian.new(@user)
end
def record_change(field_name, previous_val, new_val)
return if previous_val == new_val
diff[field_name] = [previous_val, new_val]
end
def check_result(res)
@errored = true if !res
end
def diff
@diff ||= {}
end
end
POST_TRACKED_FIELDS = %w{raw cooked edit_reason user_id wiki post_type}
attr_reader :category_changed, :post_revision
def initialize(post, topic = post.topic)
@post = post
@topic = topic
# Make sure we have only one Topic instance
post.topic = topic
end
def self.tracked_topic_fields
@@tracked_topic_fields ||= {}
@@tracked_topic_fields
end
def self.track_topic_field(field, &block)
tracked_topic_fields[field] = block
# Define it in the serializer unless it already has been defined
unless PostRevisionSerializer.instance_methods(false).include?("#{field}_changes".to_sym)
PostRevisionSerializer.add_compared_field(field)
end
end
def self.track_and_revise(topic_changes, field, attribute)
topic_changes.record_change(
field,
topic_changes.topic.public_send(field),
attribute
)
topic_changes.topic.public_send("#{field}=", attribute)
end
track_topic_field(:title) do |topic_changes, attribute|
track_and_revise topic_changes, :title, attribute
end
track_topic_field(:archetype) do |topic_changes, attribute|
track_and_revise topic_changes, :archetype, attribute
end
track_topic_field(:category_id) do |tc, category_id, fields|
if category_id == 0 && tc.topic.private_message?
tc.record_change('category_id', tc.topic.category_id, nil)
tc.topic.category_id = nil
elsif category_id == 0 || tc.guardian.can_move_topic_to_category?(category_id)
tags = fields[:tags] || tc.topic.tags.map(&:name)
if category_id != 0 && !DiscourseTagging.validate_min_required_tags_for_category(tc.guardian, tc.topic, Category.find(category_id), tags)
tc.check_result(false)
next
end
tc.record_change('category_id', tc.topic.category_id, category_id)
tc.check_result(tc.topic.change_category_to_id(category_id))
end
end
track_topic_field(:tags) do |tc, tags|
if tc.guardian.can_tag_topics?
prev_tags = tc.topic.tags.map(&:name)
next if tags.blank? && prev_tags.blank?
if !DiscourseTagging.tag_topic_by_names(tc.topic, tc.guardian, tags)
tc.check_result(false)
next
end
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if prev_tags.sort != tags.sort
tc.record_change('tags', prev_tags, tags)
DB.after_commit do
post = tc.topic.ordered_posts.first
notified_user_ids = [post.user_id, post.last_editor_id].uniq
if !SiteSetting.disable_tags_edit_notifications
Jobs.enqueue(
:notify_tag_change,
post_id: post.id,
notified_user_ids: notified_user_ids,
diff_tags: ((tags - prev_tags) | (prev_tags - tags))
)
end
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end
end
end
end
track_topic_field(:featured_link) do |topic_changes, featured_link|
if !SiteSetting.topic_featured_link_enabled ||
!topic_changes.guardian.can_edit_featured_link?(topic_changes.topic.category_id)
topic_changes.check_result(false)
else
topic_changes.record_change('featured_link', topic_changes.topic.featured_link, featured_link)
topic_changes.topic.featured_link = featured_link
end
end
# AVAILABLE OPTIONS:
# - revised_at: changes the date of the revision
# - force_new_version: bypass grace period edit window
# - bypass_rate_limiter:
# - bypass_bump: do not bump the topic, even if last post
# - skip_validations: ask ActiveRecord to skip validations
# - skip_revision: do not create a new PostRevision record
# - skip_staff_log: skip creating an entry in the staff action log
def revise!(editor, fields, opts = {})
@editor = editor
@fields = fields.with_indifferent_access
@opts = opts
@topic_changes = TopicChanges.new(@topic, editor)
# some normalization
@fields[:raw] = cleanup_whitespaces(@fields[:raw]) if @fields.has_key?(:raw)
@fields[:user_id] = @fields[:user_id].to_i if @fields.has_key?(:user_id)
@fields[:category_id] = @fields[:category_id].to_i if @fields.has_key?(:category_id)
# always reset edit_reason unless provided, do not set to nil else
# previous reasons are lost
@fields.delete(:edit_reason) if @fields[:edit_reason].blank?
Post.plugin_permitted_update_params.each do |field, val|
if @fields.key?(field) && val[:plugin].enabled?
val[:handler].call(@post, @fields[field])
end
end
if !should_revise?
# the draft sequence is advanced here to handle the edge case where a
# user opens the composer to edit a post and makes some changes (which
# saves a draft), but then un-does the changes and clicks save. In this
# case, should_revise? returns false because nothing has really changed
# in the post, but we want to get rid of the draft so we advance the
# sequence.
advance_draft_sequence if !opts[:keep_existing_draft]
return false
end
@post.acting_user = @editor
@topic.acting_user = @editor
@revised_at = @opts[:revised_at] || Time.now
@last_version_at = @post.last_version_at || Time.now
if guardian.affected_by_slow_mode?(@topic) && !grace_period_edit? && SiteSetting.slow_mode_prevents_editing
@post.errors.add(:base, I18n.t("cannot_edit_on_slow_mode"))
return false
end
@version_changed = false
@post_successfully_saved = true
@validate_post = true
@validate_post = @opts[:validate_post] if @opts.has_key?(:validate_post)
@validate_post = !@opts[:skip_validations] if @opts.has_key?(:skip_validations)
@validate_topic = true
@validate_topic = @opts[:validate_topic] if @opts.has_key?(:validate_topic)
@validate_topic = !@opts[:skip_validations] if @opts.has_key?(:skip_validations)
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@skip_revision = false
@skip_revision = @opts[:skip_revision] if @opts.has_key?(:skip_revision)
if @post.incoming_email&.imap_uid
@post.incoming_email&.update(imap_sync: true)
end
old_raw = @post.raw
Post.transaction do
revise_post
yield if block_given?
# TODO: these callbacks are being called in a transaction
# it is kind of odd, because the callback is called "before_edit"
# but the post is already edited at this point
# Trouble is that much of the logic of should I edit? is deeper
# down so yanking this in front of the transaction will lead to
# false positive.
plugin_callbacks
revise_topic
advance_draft_sequence if !opts[:keep_existing_draft]
end
# Lock the post by default if the appropriate setting is true
if (
SiteSetting.staff_edit_locks_post? &&
!@post.wiki? &&
@fields.has_key?('raw') &&
@editor.staff? &&
@editor != Discourse.system_user &&
!@post.user&.staff?
)
PostLocker.new(@post, @editor).lock
end
# We log staff/group moderator edits to posts
if (
(@editor.staff? || (@post.is_category_description? && guardian.can_edit_category_description?(@post.topic.category))) &&
@editor.id != @post.user_id &&
@fields.has_key?('raw') &&
!@opts[:skip_staff_log]
)
StaffActionLogger.new(@editor).log_post_edit(
@post,
old_raw: old_raw
)
end
# WARNING: do not pull this into the transaction
# it can fire events in sidekiq before the post is done saving
# leading to corrupt state
QuotedPost.extract_from(@post)
# This must be done before post_process_post, because that uses
# post upload security status to cook URLs.
@post.update_uploads_secure_status(source: "post revisor")
post_process_post
update_topic_word_counts
alert_users
publish_changes
grant_badge
TopicLink.extract_from(@post)
if should_create_new_version?
ReviewablePost.queue_for_review_if_possible(@post, @editor)
end
successfully_saved_post_and_topic
end
def cleanup_whitespaces(raw)
raw.present? ? TextCleaner.normalize_whitespaces(raw).gsub(/\s+\z/, "") : ""
end
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def should_revise?
post_changed? || topic_changed?
end
def post_changed?
POST_TRACKED_FIELDS.each do |field|
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if @fields.has_key?(field) && @fields[field] != @post.public_send(field)
return true
end
end
false
end
def topic_changed?
PostRevisor.tracked_topic_fields.keys.any? { |f| @fields.has_key?(f) }
end
def revise_post
if should_create_new_version?
revise_and_create_new_version
else
unless cached_original_raw
self.original_raw = @post.raw
self.original_cooked = @post.cooked
end
revise
end
end
def should_create_new_version?
return false if @skip_revision
edited_by_another_user? || !grace_period_edit? || owner_changed? || force_new_version? || edit_reason_specified?
end
def edit_reason_specified?
@fields[:edit_reason].present? && @fields[:edit_reason] != @post.edit_reason
end
def edited_by_another_user?
@post.last_editor_id != @editor.id
end
def original_raw_key
"original_raw_#{(@last_version_at.to_f * 1000).to_i}#{@post.id}"
end
def original_cooked_key
"original_cooked_#{(@last_version_at.to_f * 1000).to_i}#{@post.id}"
end
def cached_original_raw
@cached_original_raw ||= Discourse.redis.get(original_raw_key)
end
def cached_original_cooked
@cached_original_cooked ||= Discourse.redis.get(original_cooked_key)
end
def original_raw
cached_original_raw || @post.raw
end
def original_raw=(val)
@cached_original_raw = val
Discourse.redis.setex(original_raw_key, SiteSetting.editing_grace_period + 1, val)
end
def original_cooked=(val)
@cached_original_cooked = val
Discourse.redis.setex(original_cooked_key, SiteSetting.editing_grace_period + 1, val)
end
def diff_size(before, after)
@diff_size ||= begin
ONPDiff.new(before, after).short_diff.sum do |str, type|
type == :common ? 0 : str.size
end
end
end
def grace_period_edit?
return false if (@revised_at - @last_version_at) > SiteSetting.editing_grace_period.to_i
return false if @post.reviewable_flag.present?
if new_raw = @fields[:raw]
max_diff = SiteSetting.editing_grace_period_max_diff.to_i
if @editor.staff? || (@editor.trust_level > 1)
max_diff = SiteSetting.editing_grace_period_max_diff_high_trust.to_i
end
if (original_raw.size - new_raw.size).abs > max_diff ||
diff_size(original_raw, new_raw) > max_diff
return false
end
end
true
end
def owner_changed?
@fields.has_key?(:user_id) && @fields[:user_id] != @post.user_id
end
def force_new_version?
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@opts[:force_new_version] == true
end
def revise_and_create_new_version
@version_changed = true
@post.version += 1
@post.public_version += 1
@post.last_version_at = @revised_at
revise
perform_edit
bump_topic
end
def revise
update_post
update_topic if topic_changed?
create_or_update_revision
remove_flags_and_unhide_post
end
USER_ACTIONS_TO_REMOVE ||= [UserAction::REPLY, UserAction::RESPONSE]
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def update_post
if @fields.has_key?("user_id") && @fields["user_id"] != @post.user_id && @post.user_id != nil
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prev_owner = User.find(@post.user_id)
new_owner = User.find(@fields["user_id"])
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UserAction.where(target_post_id: @post.id)
.where(user_id: prev_owner.id)
.where(action_type: USER_ACTIONS_TO_REMOVE)
.update_all(user_id: new_owner.id)
if @post.post_number == 1
UserAction.where(target_topic_id: @post.topic_id)
.where(user_id: prev_owner.id)
.where(action_type: UserAction::NEW_TOPIC)
.update_all(user_id: new_owner.id)
end
end
POST_TRACKED_FIELDS.each do |field|
if @fields.has_key?(field)
@post.public_send("#{field}=", @fields[field])
end
end
@post.edit_reason = @fields[:edit_reason] if should_create_new_version?
@post.last_editor_id = @editor.id
@post.word_count = @fields[:raw].scan(/[[:word:]]+/).size if @fields.has_key?(:raw)
@post.self_edits += 1 if self_edit?
@post.extract_quoted_post_numbers
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@post_successfully_saved = @post.save(validate: @validate_post)
@post.link_post_uploads
@post.save_reply_relationships
@editor.increment_post_edits_count if @post_successfully_saved
# post owner changed
if prev_owner && new_owner && prev_owner != new_owner
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likes = UserAction.where(target_post_id: @post.id)
.where(user_id: prev_owner.id)
.where(action_type: UserAction::WAS_LIKED)
.update_all(user_id: new_owner.id)
private_message = @topic.private_message?
prev_owner_user_stat = prev_owner.user_stat
unless private_message
UserStatCountUpdater.decrement!(@post, user_stat: prev_owner_user_stat) if !@post.trashed?
prev_owner_user_stat.likes_received -= likes
end
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if @post.created_at == prev_owner.user_stat.first_post_created_at
prev_owner_user_stat.update!(first_post_created_at: prev_owner.posts.order('created_at ASC').first.try(:created_at))
end
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new_owner_user_stat = new_owner.user_stat
unless private_message
UserStatCountUpdater.increment!(@post, user_stat: new_owner_user_stat) if !@post.trashed?
new_owner_user_stat.likes_received += likes
end
new_owner_user_stat.save!
end
end
def self_edit?
@editor == @post.user
end
def remove_flags_and_unhide_post
return if @opts[:deleting_post]
return unless editing_a_flagged_and_hidden_post?
flaggers = []
@post.post_actions.where(post_action_type_id: PostActionType.flag_types_without_custom.values).each do |action|
flaggers << action.user if action.user
action.remove_act!(Discourse.system_user)
end
@post.unhide!
PostActionNotifier.after_post_unhide(@post, flaggers)
end
def editing_a_flagged_and_hidden_post?
self_edit? &&
@post.hidden &&
@post.hidden_reason_id == Post.hidden_reasons[:flag_threshold_reached]
end
def update_topic
Topic.transaction do
PostRevisor.tracked_topic_fields.each do |f, cb|
if !@topic_changes.errored? && @fields.has_key?(f)
cb.call(@topic_changes, @fields[f], @fields)
end
end
unless @topic_changes.errored?
@topic_changes.check_result(@topic.save(validate: @validate_topic))
end
end
end
def create_or_update_revision
return if @skip_revision
# don't create an empty revision if something failed
return unless successfully_saved_post_and_topic
@version_changed ? create_revision : update_revision
end
def create_revision
modifications = post_changes.merge(@topic_changes.diff)
if modifications["raw"]
modifications["raw"][0] = cached_original_raw || modifications["raw"][0]
end
if modifications["cooked"]
modifications["cooked"][0] = cached_original_cooked || modifications["cooked"][0]
end
@post_revision = PostRevision.create!(
user_id: @post.last_editor_id,
post_id: @post.id,
number: @post.version,
modifications: modifications,
hidden: only_hidden_tags_changed?
)
end
def update_revision
return unless revision = PostRevision.find_by(post_id: @post.id, number: @post.version)
revision.user_id = @post.last_editor_id
modifications = post_changes.merge(@topic_changes.diff)
modifications.each_key do |field|
if revision.modifications.has_key?(field)
old_value = revision.modifications[field][0]
new_value = modifications[field][1]
if old_value.to_s != new_value.to_s
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revision.modifications[field] = [old_value, new_value]
else
revision.modifications.delete(field)
end
else
revision.modifications[field] = modifications[field]
end
end
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# should probably do this before saving the post!
if revision.modifications.empty?
revision.destroy
@post.last_editor_id = PostRevision.where(post_id: @post.id).order(number: :desc).pluck_first(:user_id) || @post.user_id
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@post.version -= 1
@post.public_version -= 1
@post.save(validate: @validate_post)
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else
revision.save
end
end
def post_changes
@post.previous_changes.slice(*POST_TRACKED_FIELDS)
end
def topic_diff
@topic_changes.diff
end
def perform_edit
return if bypass_rate_limiter?
EditRateLimiter.new(@editor).performed!
end
def bypass_rate_limiter?
@opts[:bypass_rate_limiter] == true
end
def bump_topic
return if bypass_bump? || !is_last_post?
@topic.update_column(:bumped_at, Time.now)
TopicTrackingState.publish_muted(@topic)
TopicTrackingState.publish_unmuted(@topic)
TopicTrackingState.publish_latest(@topic)
end
def bypass_bump?
!@post_successfully_saved ||
@topic_changes.errored? ||
@opts[:bypass_bump] == true ||
@post.whisper? ||
only_hidden_tags_changed?
end
def only_hidden_tags_changed?
return false if (hidden_tag_names = DiscourseTagging.hidden_tag_names).blank?
modifications = post_changes.merge(@topic_changes.diff)
if modifications.keys.size == 1 && (tags_diff = modifications["tags"]).present?
a, b = tags_diff[0] || [], tags_diff[1] || []
changed_tags = ((a + b) - (a & b)).map(&:presence).compact
if (changed_tags - hidden_tag_names).empty?
return true
end
end
false
end
def is_last_post?
!Post.where(topic_id: @topic.id)
.where("post_number > ?", @post.post_number)
.exists?
end
def plugin_callbacks
DiscourseEvent.trigger(:before_edit_post, @post, @fields)
DiscourseEvent.trigger(:validate_post, @post)
end
def revise_topic
return unless @post.is_first_post?
update_topic_excerpt
update_category_description
hide_welcome_topic_banner
end
def update_topic_excerpt
@topic.update_excerpt(@post.excerpt_for_topic)
end
def update_category_description
return unless category = Category.find_by(topic_id: @topic.id)
doc = Nokogiri::HTML5.fragment(@post.cooked)
doc.css("img").remove
if html = doc.css("p").first&.inner_html&.strip
new_description = html unless html.starts_with?(Category.post_template[0..50])
category.update_column(:description, new_description)
@category_changed = category
else
@post.errors.add(:base, I18n.t("category.errors.description_incomplete"))
end
end
def hide_welcome_topic_banner
return unless guardian.is_admin?
return unless @topic.id == SiteSetting.welcome_topic_id
return unless Discourse.cache.read(Site.welcome_topic_banner_cache_key(@editor.id))
Discourse.cache.write(Site.welcome_topic_banner_cache_key(@editor.id), false)
MessageBus.publish("/site/welcome-topic-banner", false)
end
def advance_draft_sequence
@post.advance_draft_sequence
end
def post_process_post
@post.invalidate_oneboxes = true
@post.trigger_post_process
DiscourseEvent.trigger(:post_edited, @post, self.topic_changed?, self)
end
def update_topic_word_counts
DB.exec("UPDATE topics
SET word_count = (
SELECT SUM(COALESCE(posts.word_count, 0))
FROM posts
WHERE posts.topic_id = :topic_id
)
WHERE topics.id = :topic_id", topic_id: @topic.id)
end
def alert_users
return if @editor.id == Discourse::SYSTEM_USER_ID
Jobs.enqueue(:post_alert, post_id: @post.id)
end
def publish_changes
options =
if !@topic_changes.diff.empty? && !@topic_changes.errored?
{ reload_topic: true }
else
{}
end
DiscourseEvent.trigger(:before_post_publish_changes, post_changes, @topic_changes, options)
@post.publish_change_to_clients!(:revised, options)
end
def grant_badge
BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
end
def successfully_saved_post_and_topic
@post_successfully_saved && !@topic_changes.errored?
end
def guardian
@guardian ||= Guardian.new(@editor)
end
end